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Better bridge direction detection. #1068

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This commit is contained in:
Alessandro Ranellucci 2013-03-29 23:49:58 +01:00
parent 5beb2187d3
commit d4119b0eb1
1 changed files with 49 additions and 13 deletions
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62
lib/Slic3r/Layer/Region.pm
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@ -1,8 +1,9 @@
package Slic3r::Layer::Region;
use Moo;
use List::Util qw(sum first);
use Slic3r::ExtrusionPath ':roles';
use Slic3r::Geometry qw(PI scale chained_path_items points_coincide);
use Slic3r::Geometry qw(PI X1 X2 Y1 Y2 A B scale chained_path_items points_coincide);
use Slic3r::Geometry::Clipper qw(safety_offset union_ex diff_ex intersection_ex);
use Slic3r::Surface ':types';
@ -556,9 +557,9 @@ sub process_external_surfaces {
if (0) {
require "Slic3r/SVG.pm";
Slic3r::SVG::output("bridge.svg",
polygons => [ $surface->p ],
red_polygons => [ map @$_, @lower ],
Slic3r::SVG::output("bridge_$surface.svg",
expolygons => [ $surface->expolygon ],
red_expolygons => [ @lower ],
polylines => [ @edges ],
);
}
@ -579,16 +580,51 @@ sub process_external_surfaces {
$bridge_angle = Slic3r::Geometry::rad2deg_dir($line->direction);
}
} elsif (@edges) {
my $center = Slic3r::Geometry::bounding_box_center([ map @$_, @edges ]);
my $x = my $y = 0;
foreach my $point (map @$_, @edges) {
my $line = Slic3r::Line->new($center, $point);
my $dir = $line->direction;
my $len = $line->length;
$x += cos($dir) * $len;
$y += sin($dir) * $len;
# inset the bridge expolygon; we'll use this one to clip our test lines
my $inset = [ $surface->expolygon->offset_ex($self->infill_flow->scaled_width) ];
# detect anchors as intersection between our bridge expolygon and the lower slices
my $anchors = intersection_ex(
[ $surface->p ],
[ map @$_, @lower ],
);
# we'll now try several directions using a rudimentary visibility check:
# bridge in several directions and then sum the length of lines having both
# endpoints within anchors
my %directions = (); # angle => score
my $angle_increment = PI/36; # 5°
my $line_increment = $self->infill_flow->scaled_width;
for (my $angle = 0; $angle <= PI; $angle += $angle_increment) {
# rotate everything - the center point doesn't matter
$_->rotate($angle, [0,0]) for @$inset, @$anchors;
# generate lines in this direction
my $bounding_box = [ Slic3r::Geometry::bounding_box([ map @$_, map @$_, @$anchors ]) ];
my @lines = ();
for (my $x = $bounding_box->[X1]; $x <= $bounding_box->[X2]; $x += $line_increment) {
push @lines, [ [$x, $bounding_box->[Y1]], [$x, $bounding_box->[Y2]] ];
}
$bridge_angle = Slic3r::Geometry::rad2deg_dir(atan2($y, $x));
# TODO: use a multi_polygon_multi_linestring_intersection() call
my @clipped_lines = map @{ Boost::Geometry::Utils::polygon_multi_linestring_intersection($_, \@lines) }, @$inset;
# remove any line not having both endpoints within anchors
@clipped_lines = grep {
my $line = $_;
!(first { $_->encloses_point_quick($line->[A]) } @$anchors)
&& !(first { $_->encloses_point_quick($line->[B]) } @$anchors);
} @clipped_lines;
# sum length of bridged lines
$directions{-$angle} = sum(map Slic3r::Geometry::line_length($_), @clipped_lines) // 0;
}
# this could be slightly optimized with a max search instead of the sort
my @sorted_directions = sort { $directions{$a} <=> $directions{$b} } keys %directions;
# the best direction is the one causing most lines to be bridged
$bridge_angle = Slic3r::Geometry::rad2deg_dir($sorted_directions[-1]);
}
Slic3r::debugf " Optimal infill angle of bridge on layer %d is %d degrees\n",